package main

func main() {
	//var userinfo map[string]string
	//userinfo["username"] = "张三"
	//fmt.Println(userinfo)

	//var userinfo = make(map[string]string)
	//userinfo["username"] = "张三"
	//fmt.Println(userinfo)

	//var a []int
	//a[0] = 123
	//fmt.Println(a)

	//var a = make([]int, 5, 6)
	//a[0] = 123
	//fmt.Println(a)

	//var a *int	//指针也是引用数据类型
	//*a = 10
	//fmt.Println(a)
}
